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Cannot cross-compile from x86_64 to i686 with LLVM 8 #356

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RalfJung opened this issue May 18, 2020 · 4 comments
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Cannot cross-compile from x86_64 to i686 with LLVM 8 #356

RalfJung opened this issue May 18, 2020 · 4 comments

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@RalfJung
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As @eddyb found out, #311 introduced a regression on old versions of LLVM: cross-compilation to i686-unknown-linux-gnu on an x86_64 host is broken. In particular this currently prevents us from ensuring 32bit tests work on PR CI.
@RalfJung RalfJung mentioned this issue May 18, 2020
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@RalfJung
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One option might be to simply revert that PR, since (from what I can see in rust-lang/rust#58599) the unordered intrinsics are not actually used. But then I wonder why they lead to problems.

@Mark-Simulacrum
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It seems like at least gating them on LLVM >= 9 or whatever would be reasonable...

@RalfJung
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Does compiler-builtins have infrastructure for LLVM version gating?

@Amanieu
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Amanieu commented Feb 6, 2022

Rust no longer supports LLVM 8.

@Amanieu Amanieu closed this as completed Feb 6, 2022
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@Amanieu @RalfJung @Mark-Simulacrum